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Eavesdropping of Two-Way Coherent-State Quantum Cryptography via Gaussian Quantum Cloning Machines

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4 Author(s)
Pirandola, S. ; Res. Lab. of Electron., Massachusetts Inst. of Technol., Cambridge, MA ; Mancini, S. ; Lloyd, S. ; Braunstein, S.L.

We consider one of the quantum key distribution protocols recently introduced in Ref. [Pirandola et al., Nature Phys. 4, 726 (2008)]. This protocol consists of a two-way quantum communication between Alice and Bob, where Alice encodes secret information via a random phase-space displacement of a coherent state. In particular, we study its security against a specific class of individual attacks which are based on combinations of Gaussian quantum cloning machines.

Published in:

Quantum, Nano and Micro Technologies, 2009. ICQNM '09. Third International Conference on

Date of Conference:

1-7 Feb. 2009